@color: #ff1818; /*// Try other colors, like #18ffa0*/
@rotation: 25deg;
@pivot-distance: 20px;
@width: 150px;
@height: calc(1.3 * @width);

body, html {
  width: 100%;
  height: 100%;
}


body {
  background-color: #fafcff;
  background-image: radial-gradient(circle, transparent, #afb5bf), linear-gradient(transparent, #d3d8e0);
  display: flex;
  align-items: center;
  justify-content: center;
}


.switch {
  background-color: black;
  width: @width;
  height: @height;
  box-shadow:
      0 0 10px 2px rgba(0, 0, 0, 0.2), /*// The surrounding shadow (first layer)*/
      0 0 1px 2px black, /*// The surrounding shadow (second layer)*/
      inset 0 2px 2px -2px white, /*// The top white "shine"*/
      inset 0 0 2px 15px #47434c, /*// The light gray frame*/
      inset 0 0 2px 22px black; /*// The internal black shadow*/
  border-radius: 5px;
  padding: 20px;
  perspective: 700px;

  input {
    display: none;

    &:checked + .button {
      transform: translateZ(@pivot-distance) rotateX(@rotation);
      box-shadow: 0 -10px 20px @color;

      .light {
        animation: flicker 0.2s infinite 0.3s;
      }

      .shine {
        opacity: 1;
      }

      .shadow {
        opacity: 0;
      }
    }
  }

  .button {
    transition: all 0.3s cubic-bezier(1, 0, 1, 1);
    transform-origin: center center @pivot-distance;
    transform: translateZ(@pivot-distance) rotateX(@rotation);
    transform-style: preserve-3d;
    background-color: #9b0621;
    width: 100%;
    height: 100%;
    position: relative;
    cursor: pointer;
    background: linear-gradient(darken(@color, 25%) 0%, darken(@color, 33%) 30%, darken(@color, 33%) 70%, darken(@color, 25%) 100%);
    background-repeat: no-repeat;

    &::before {
      content: "";
      background: linear-gradient(rgba(255, 255, 255, 0.8) 10%, rgba(255, 255, 255, 0.3) 30%,
      darken(@color, 35%) 75%, darken(@color, 45%)) 50% 50% / 97% 97%, darken(@color, 20%);
      background-repeat: no-repeat;
      width: 100%;
      height: 50px;
      transform-origin: top;
      transform: rotateX(-90deg);
      position: absolute;
      top: 0;
    }

    &::after {
      content: "";
      background-image: linear-gradient(darken(@color, 35%), darken(@color, 45%));
      width: 100%;
      height: 50px;
      transform-origin: top;
      transform: translateY(50px) rotateX(-90deg);
      position: absolute;
      bottom: 0;
      box-shadow: 0 50px 8px 0px black, 0 80px 20px 0px rgba(0, 0, 0, 0.5);
    }
  }

  .light {
    opacity: 0;
    animation:  light-off 1s;
    position: absolute;
    width: 100%;
    height: 100%;
    background-image:
      /*// We use adjust-hue() here to make the center of the light a bit different in color
      // This is a nice tool for visualizing it https://sassme.jim-nielsen.com/*/
        radial-gradient(adjust-hue(lighten(@color, 20%), 35), @color 40%, transparent 70%);
  }

  .dots {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(transparent 30%, rgba(darken(@color, 35%), 0.7) 70%);
    background-size: 10px 10px;
  }

  .characters {
    position: absolute;
    width: 100%;
    height: 100%;

    /*// Drawing with gradients!
    // Read more about it here: https://css-tricks.com/drawing-images-with-css-gradients/
    // And check this collection out: https://a.singlediv.com/*/
    // White vertical line
    background:
        linear-gradient(white, white) 50% 20% / 5% 20%,
        radial-gradient(circle, transparent 50%, white 52%, white 70%, transparent 72%) 50% 80% / 33% 25%; // White circle
    background-repeat: no-repeat;
  }

  .shine {
    transition: all 0.3s cubic-bezier(1, 0, 1, 1);
    opacity: 0.3;
    position: absolute;
    width: 100%;
    height: 100%;
    background:
        linear-gradient(white, transparent 3%) 50% 50% / 97% 97%,
        linear-gradient(rgba(255, 255, 255, 0.5), transparent 50%, transparent 80%, rgba(255, 255, 255, 0.5)) 50% 50% / 97% 97%;
    background-repeat: no-repeat;
  }

  .shadow {
    transition: all 0.3s cubic-bezier(1, 0, 1, 1);
    opacity: 1;
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(transparent 70%, rgba(0, 0, 0, 0.8));
    background-repeat: no-repeat;
  }
}

@keyframes flicker {
  0% {opacity: 1}
  80% {opacity: 0.8}
  100% {opacity: 1}
}

@keyframes light-off {
  0% {opacity: 1}
  80% {opacity: 0}
}